Plastic packaging bags are often seen or used in people's daily life, such as food packaging bags, cosmetics packaging bags, electronic products packaging bags and so on. Because of its low cost, convenient to use, excellent barrier ability, eye-catching appearance and other characters, let plastic bags are widely used in all walks of life. But have you ever thought about how plastic bags are made? The following is a brief introduction to the production process of plastic bags. We hope you can take good care of the environment and choose more high-quality plastic bag suppliers like us to produce packaging bags for your products.
Step by step Process of Manufacture
1. Blowing
Blowing is to blow purchased raw material particles through the blow machine into plastic film, to blown raw material into different thickness, different width of plastic film according to different needs.
2. Plate making
According to the customer's artwork requirements to make printing renderings, and then confirmed with the customer, then send the final confirmed artwork file to professional copper plate maker, the plate maker will to make plates according to the artwork design. Each color needs to make a printing plate. The more complex colors, the more plates need to make. It usually takes about 7 days to ready plates.
3. Printing
The copper plate is mounted into the printing machine, then printing can be start. Gravure technology is used to print bags, because this technology is suitable for order with large quantity, and can produce the best printing colors, printing colors will looks vividly and eye catching on bag
4.Compound or Laminating
This step is to laminating or compound multiple layers which have different properties and functions together to form bag panels.
5.Making bag
This is the final step to produce bags.This step is to make bags into different shapes/style,like stand up bag, three side seal bag, back seal bag, side gusset bag, flat bottom bag, etc.
6.Shipping
At this point, the bags come off the end of the production line. The finished empty bags are shipped to the brand owner for filling their product and sealing.